{"id":4802,"date":"2013-04-12T20:03:38","date_gmt":"2013-04-12T19:03:38","guid":{"rendered":"http:\/\/www.iprog.it\/blog\/?p=4802"},"modified":"2013-04-12T20:03:38","modified_gmt":"2013-04-12T19:03:38","slug":"le-basi-di-uicollectionview","status":"publish","type":"post","link":"https:\/\/www.iprog.it\/blog\/objective-c-ios\/le-basi-di-uicollectionview\/","title":{"rendered":"Le basi di UICollectionView"},"content":{"rendered":"

Per chi ha dimestichezza con l’UITableView <\/strong>di sicuro non ha problemi a implementare i metodi del UICollectionView. <\/strong>Praticamente questo oggetto \u00e8 l’insieme di una UIScrollView<\/strong> che \u00e8 la superView<\/em> di se stessa e di una UIView<\/strong> che sono le celle. Creiamo un progetto su Xcode Single-View-Application.<\/strong> Nello storyboard troviamo UICollectionView <\/strong>nell pannello di tutti gli oggetti e trasciniamolo nella view. (!<\/em> Attenzione<\/em> a non trascinare UICollectionViewController<\/strong>) . Selezioniamo la cella e inseriamo un identificatore “Cell” nell pannello a destra. Fatto questo andiamo nel file del intestazione e creiamo un istanza del UICollectionView :<\/strong><\/p>\n

[code lang=”obj-c”]
\n@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;
\n[\/code]<\/p>\n

Poi andiamo nel Storyboard e colleghiamo l’outlet creata con l’oggetto.
\nAdesso sempre nel file del intestazione inseriamo un protocollo:”UICollectionViewDataSource<\/em><\/strong>“. Se selezioniamo questo protocollo vediamo nel pannello a destra la descrizione. Selezioniamo la voce “Reference”:
\n\"Schermata<\/a>
\nSi apre una nuova finestra della documentazione di questo protocollo. Vediamo i metodi che ci interessano e le implementiamo nella nostra classe:<\/p>\n

[code lang=”obj-c”]
\n– (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
\n{
\n return 2;
\n}<\/p>\n

– (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
\n{
\n static NSString *cellIdentifier = @&quot;Cell&quot;;<\/p>\n

UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];<\/p>\n

UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, cell.bounds.size.width, cell.bounds.size.height)];<\/p>\n

NSArray *images = @[@&quot;Tiger.jpg&quot;, @&quot;Nature.jpg&quot;];<\/p>\n

img.image = [UIImage imageNamed:[images objectAtIndex:indexPath.item]];<\/p>\n

[cell.contentView addSubview:img];
\n return cell;
\n}
\n[\/code]<\/p>\n

Praticamente abbiamo dichiarato quante celle vogliamo nel metodo “numberOfItemsInSection” e cosa deve apparire in ogni cella. In questo caso abbiamo inserito 2 immagini. Finito questo testiamo il progetto e vediamo il risultato.<\/p>\n

\"Schermata<\/a><\/p>\n

\"download<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Per chi ha dimestichezza con l’UITableView di sicuro non ha problemi a implementare i metodi del UICollectionView. Praticamente questo oggetto \u00e8 l’insieme di una UIScrollView che \u00e8 la superView di se stessa e di una UIView che sono le celle. Creiamo un progetto su Xcode Single-View-Application. Nello storyboard troviamo UICollectionView… Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":4805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[2072,2074,2073,1092,1510,1589],"class_list":["post-4802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-objective-c-ios","tag-uicollectionview","tag-uicollectionviewcell","tag-uicollectionviewcontroller","tag-uiscrollview","tag-uitableview","tag-uiview"],"yoast_head":"\nLe basi di UICollectionView - iProg<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.iprog.it\/blog\/objective-c-ios\/le-basi-di-uicollectionview\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Le basi di UICollectionView - iProg\" \/>\n<meta name=\"twitter:description\" content=\"Per chi ha dimestichezza con l’UITableView di sicuro non ha problemi a implementare i metodi del UICollectionView. 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